[Webkit-unassigned] [Bug 182598] New: After opening a link in a new tab, the page center is off at first

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182598

            Bug ID: 182598
           Summary: After opening a link in a new tab, the page center is
                    off at first
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: macOS 10.13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tobi at tobireif.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 333363

  --> https://bugs.webkit.org/attachment.cgi?id=333363&action=review

screen recording

After opening a link in a new tab, the page center is off at first (or perhaps the new (hidden) tab is very small at first?)

In Safari, open https://tobireif.com/demos/ . Open the Swirls demo in a new tab (eg using cmd-click). The page opens in (in a new tab in the foreground).
The swirls originate from the center.

In Safari Tech Preview, open https://tobireif.com/demos/ . Open the Swirls demo in a new tab (eg using cmd-click). The page opens in (in a new tab in the background - that's OK). Click on that tab.
The swirls at first don't originate from the center (as intended), instead they originate from a place near top left. Only after that they originate from the center (as intended).

(Also, sometimes clicking on a tab to switch to that tab doesn't work.)

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